Does anybody have any information about this? Hello? Bueller? Bueller?
It's not documented, but the default roll-over size is 0 messages. Which is really too small, and won't perform any better than the standard file PM. There is an MBean property you can set (In 3.2Beta), or maybe in the latest 3.0 branch, which you can use to set the size to something like 300-400 messages. The property is named something like "RollOverSize", which can be set in the jbossmq-service.xml file. I suggest downloading the source and taking a look yourself.